3 years ago

Benzonitrile and dicyanocarbazole derived electron transport type host materials for improved device lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes

Sung Yong Byun, Kyung Hyung Lee, Jun Yeob Lee
Three electron transport type host materials, 1DBF-2CNCZ, 2DBF-2CNCZ and 4DBF-2CNCZ, for blue thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs) were synthesized and characterized. The host materials shared a benzonitrile unit and dicyanocarbazole unit as the electron transport moieties, and had isomeric molecular structure with different substitution positions of the dibenzofuran moiety. They showed high triplet energy above 3.0 eV by a twisted molecular structure and were applied as the electron transport type host in the mixed host system with a hole transport type mCBP host for blue TADF OLEDs. The blue TADF OLEDs developed using the 4DBF-2CNCZ host demonstrated high EQE over 20% and 31.2 h lifetime up to 75% of initial luminance at 500 cd/m2 at a mixed host composition of mCBP:4DBF-2CNCZ (25:75).
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